Display panel

ABSTRACT

The present disclosure relates to a display panel including a display area that can be stretched by including a plurality of stretching units and a peripheral area positioned at an edge of the display area. Each of the stretching units includes: a plurality of islands separately disposed to include a plurality of pixels disposed therein; a plurality of bridges extended from the islands to connect adjacent islands or to connect the islands with the peripheral area; and a plurality of openings disposed adjacent to the bridges, between the bridges, and between the bridges and the islands, wherein areas of the islands are gradually increased toward the peripheral area.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of U.S. patentapplication Ser. No. 17/736,900, filed on May 4, 2022, which is acontinuation application of U.S. patent application Ser. No. 17/020,694filed on Sep. 14, 2020 (U.S. Pat. No. 11,334,119), which is acontinuation application of U.S. patent application Ser. No. 16/584,822filed on Sep. 26, 2019 (U.S. Pat. No. 10,802,545), which is acontinuation application of U.S. patent application Ser. No. 15/678,506filed on Aug. 16, 2017 (U.S. Pat. No. 10,466,746), which claims priorityto Korean Patent Application No. 10-2016-0105110 filed on Aug. 18, 2016in the Korean Intellectual Property Office; the related applications areincorporated by reference.

TECHNICAL BACKGROUND (a) Technical Field

The technical field relates to a display panel.

(b) Description of the Related Art

A flexible display panel can be included in a rollable display device, afoldable display device, a bendable display device, and/or a stretchabledisplay device. A significant amount of rolling, folding, bending,and/or stretching may result in damage to the display panel due toaccumulation of physical breakage or fatigue.

The above information disclosed in this Background section is forenhancement of understanding of the background of this application. TheBackground section may contain information that does not form the priorart that is already known in this country to a person of ordinary skillin the art.

SUMMARY

Embodiment may be related a display panel, e.g., a flexible and/orstretchable display panel. The display panel may endure a significantamount of use without critical physical breakage between a display areaand a peripheral area even if these two areas have different elongationratios.

An embodiment may be related to a display panel that includes thefollowing elements: a display area including a plurality of stretchableunits; and a peripheral area positioned at an edge of the display area,wherein each of the stretchable units includes: a plurality of islandsseparately disposed to include a plurality of pixels disposed therein; aplurality of bridges extending from the islands to connect adjacentislands or to connect the islands with the peripheral area; and aplurality of openings disposed adjacent to the bridges, between thebridges, and between the bridges and the islands, wherein areas of theislands (gradually) increase toward the peripheral area.

Widths of the bridges may (gradually) increase toward the peripheralarea.

Areas of the openings may (gradually) reduce toward the peripheral area.

Areas of the islands may (gradually) increase toward the peripheral areafor the stretchable units between the peripheral area and an area whichcorresponds to 1% of a length/width of the display panel from theperipheral area.

The display panel may include: a substrate including the display areaand the peripheral area; and a plurality of insulating layers stacked onthe substrate, and the openings may extend through the insulating layersand the substrate.

Each of the openings may have a dumbbell-shaped, circular, cross-shaped,flange-shaped, or polygonal cross-section.

An embodiment may be related to a display panel that includes thefollowing element: a display area including a plurality of stretchableunits; and a peripheral area positioned at an edge of the display area,wherein each of the stretchable units includes: a plurality of islandsseparately disposed to include a plurality of pixels disposed therein; aplurality of bridges extending from the islands to connect adjacentislands or to connect the islands with the peripheral area; and aplurality of openings disposed adjacent to the bridges, between thebridges, and between the bridges and the islands, wherein widths ofbridges that connect islands with the edge are wider than bridges thatconnect islands.

An area of an island that is closest to the edge may be greater thanthat of an island farther from the edge.

An area of an opening that is closest to the edge may be less than thatof another of the openings.

Areas of the islands may (gradually) increase toward the edge for thestretchable units between the peripheral area and an area whichcorresponds to 1% of a length/width of the display panel from theperipheral area.

The display panel may include a substrate and a plurality of insulatinglayers stacked on the substrate, and the openings may extend through theinsulating layers and the substrate.

An embodiment may be related to a display panel. The display panel mayinclude an insulating layer and a first pixel. The insulating layer mayinclude a first edge, a second edge, and a set of openings. The set ofopenings may be positioned between the first edge and the second edgeand may include a first opening and a second opening. A minimum distancebetween the first opening and the first edge may be less than a minimumdistance between the second opening and the first edge and may be lessthan a minimum distance between the second opening and the second edge.The first opening may be smaller than the second opening. The firstpixel may include a first transistor. The first transistor and/or thefirst pixel may be positioned between the first opening and the secondopening (e.g., in a plan view of the display panel).

The insulating layer may include a third opening and a fourth opening.The third opening immediately neighbors the first opening with nointervening opening. The fourth opening immediately neighbors the secondopening without any intervening opening. A minimum distance between thefirst opening and the third opening may be greater than a minimumdistance between the second opening and the fourth opening.

The insulating layer may include a third edge and a fourth edge. The setof openings may be positioned between the third edge and the fourth edgeand may include a third opening. A minimum distance between the thirdopening and the third edge may be less than a minimum distance betweenthe second opening and the third edge and may be less than a minimumdistance between the second opening and the fourth edge. The thirdopening may be smaller than the second opening.

The set of openings may include a fourth opening. The fourth opening maybe positioned between the first opening the third edge, may bepositioned between the third opening and the first edge, and may besmaller than the second opening.

The fourth opening may extend perpendicular to the first opening.

Shapes of the openings may include at least one of a dumbbell shape, acircular shape, a flange shape, and a polygonal shape.

The set of openings may include a third opening. The third opening maybe positioned between the second opening and the second edge and may belarger than the second opening.

The minimum distance between the second opening and the second edge maybe less than or equal to 99% of a distance between the first edge andthe second edge.

The set of openings may include a third opening. The third opening maybe positioned between the second opening and the second edge, may be aslarge as the second opening, and may be larger than the first opening.

The first opening may immediately neighbor the first edge with nointervening opening. The set of openings may include a third opening.The third opening may immediately neighbor the second opening withoutany intervening opening. A minimum distance between the first openingand the first edge may be greater than a minimum distance between thesecond opening and the third opening.

The second opening may extend perpendicular to the first opening.

The set of openings may include a third opening. The third opening maybe positioned between the first opening and the second opening, mayimmediately neighbor each of the first opening and the second openingwith no intervening openings, may be larger than the first opening, andmay be smaller than the second opening.

A minimum distance between the first opening and the third opening maybe greater than a minimum distance between the second opening and thethird opening.

The third opening may extend perpendicular to at least one of the firstopening and the second opening.

The display panel may include a substrate. The substrate may overlap thefirst pixel, may overlap the insulating layer, and may include a set ofholes. The holes may be respectively aligned with the openings.

The insulating layer may include a third edge and a fourth edge. The setof openings may be positioned between the third edge and the fourthedge. A minimum distance between the first opening and the third edgemay be greater than a minimum distance between the second opening andthe third edge. A minimum distance between the first opening and thefourth edge may be greater than a minimum distance between the secondopening and the fourth edge.

The first opening may extend parallel to the second opening.

The first opening may extend perpendicular to the second opening.

The set of openings may include a first plurality of openings and asecond plurality of openings. The first plurality of openings mayinclude the first opening and may be positioned between the secondplurality of openings and the first edge. The second plurality ofopenings may include the second opening. Each opening of the secondplurality of openings may be larger than each opening of the firstplurality of openings.

The set of openings may include a first plurality of openings and asecond plurality of openings. The first plurality of openings mayinclude the first opening and may surround the second plurality ofopenings. The second plurality of openings may include the secondopening. Each opening of the second plurality of openings may be largerthan each opening of the first plurality of openings.

According to embodiments, potential physical breakage between a displayarea and a peripheral area may be minimized or prevented.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 schematically illustrates a plan view a display panel accordingto an embodiment.

FIG. 2 schematically illustrates a stretchable unit which is notstretched according to an embodiment.

FIG. 3 schematically illustrates a stretched stretchable unit withexpanded openings according to an embodiment.

FIG. 4 is an enlarged view schematically illustrating an area B of FIG.1 .

FIG. 5 is an enlarged view schematically illustrating a portion of adisplay panel according to an embodiment.

FIG. 6 schematically illustrates a portion of a display panel accordingto an embodiment.

FIG. 7 schematically illustrates an area C of FIG. 1 according to anembodiment.

FIG. 8 schematically illustrates an area C of FIG. 1 according to anembodiment.

FIG. 9 schematically illustrates an area C of FIG. 1 according to anembodiment.

FIG. 10 schematically illustrates an area C of FIG. 1 according to anembodiment.

FIG. 11 is a cross-sectional view taken along a line XI-XI of FIG. 2 .

DETAILED DESCRIPTION OF EMBODIMENTS

Example embodiments are described with reference to the accompanyingdrawings. Although the terms “first”, “second”, etc. may be used hereinto describe various elements, these elements, should not be limited bythese terms. These terms may be used to distinguish one element fromanother element. Thus, a first element discussed below may be termed asecond element without departing from teachings of one or moreembodiments. The description of an element as a “first” element may notrequire or imply the presence of a second element or other elements. Theterms “first”, “second”, etc. may also be used herein to differentiatedifferent categories or sets of elements. For conciseness, the terms“first”, “second”, etc. may represent “first-category (or first-set)”,“second-category (or second-set)”, etc., respectively.

When a first element (such as a layer, film, region, or substrate) isreferred to as being “on” a second element, the first element can bedirectly on the second element, or one or more intervening elements maybe present between the first element and the second element.

FIG. 1 schematically illustrates a display panel 100 according to anembodiment.

As illustrated in FIG. 1 , the display panel 100 according to thepresent embodiment includes a display area DA and a peripheral area PA.FIG. 2 and FIG. 3 are enlarged views illustrating a portion of an area Aof FIG. 1 according to one or more embodiments. FIG. 2 schematicallyillustrates a stretchable unit 110 which is not stretched, and FIG. 3schematically illustrates the stretched stretchable unit 110 withexpanded openings 116.

In an embodiment, the display area DA may include a plurality ofstretchable units 110 (formed of one or more insulating materials) toenable stretching of the display panel 100. A stretchable unit 110disposed in the display area DA includes one or more islands 112, one ormore bridges 114, and one or more openings 116, and is a stretchablebasic unit of the stretchable display panel 100. The island 112indicates an insulating portion in/on which a pixel 111 is disposed.

Islands 112 are disposed apart from each other. A pixel 111 is disposedin each of the islands 112. A red pixel unit, a green pixel unit, and ablue pixel unit are disposed in parallel to constitute a pixel 111 inthe enlarged view of the enlarged area A of FIG. 1 . In an embodiment, ared pixel unit, a green pixel unit, and a blue pixel unit may beseparately disposed on different respective islands 112.

A bridge 114 may extend from a boundary of an island 112 and connect toan immediately adjacent island 112 or may connect an island 112 with theperipheral area PA. Wires that connect the pixels disposed in theislands 112 may be disposed in the bridges 114. The pixels 111 disposedin the islands 112 can be driven by receiving power and electricalsignals through the wires disposed in the bridge 114.

An opening 116 may be disposed between bridges 114, between a bridge 114and an island 112, between a bridge 114 and the peripheral area PA,and/or between an island 112 and the peripheral area PA. The shapeand/or area of an opening 116 can be changed for/in stretching of thedisplay panel 100. The opening 116 will be described in more detail withreference to FIG. 2 and FIG. 3 .

As illustrated in FIG. 2 and FIG. 3 , the display panel 100 is stretchedwhile sizes of openings 116 included in the stretchable unit 110 arechanged. In an embodiment, the shapes or areas of island 112 may besubstantially maintained, and the positions and/or orientations of theislands 112 may be changed. Therefore, integrity of the pixels 111disposed on the islands 112 can be substantially maintained withoutsignificant breakage regardless of the stretching state of the displaypanel 100, and an image displayed by the display panel 100 can also bemaintained.

In the peripheral area PA, which is disposed at an edge BD of thedisplay area DA, elements such as a driving circuit (for transmittingpower and display signals to the pixels 111 disposed in the display areaDA), a driving chip, various wires, and a printed circuit board (PCB)are disposed. According to an embodiment, the peripheral area PA mayhave relatively low elongation as compared to the display area DA inorder to protect the elements disposed in the peripheral area PA.

Breakage may occur at the boundary of the bridges 114 or the islands 112connecting the display area DA and the peripheral area PA because of adifference in elongation between the display area DA (which includes thestretchable unit 110) and the peripheral area PA (which has a relativelylow elongation rate). An embodiment may prevent significant breakage ofbridges 114 or islands 112 from occurring at a boundary between thedisplay area DA and the peripheral area PA.

According to an embodiment, areas of the islands 112 may (gradually)increase toward the peripheral area PA from the display area DA. Widthsof bridges 114 connecting the islands 112 can also (gradually) increasetoward the peripheral area PA. In contrast, the areas of openings 116can (gradually) reduce toward the peripheral area PA.

FIG. 4 is an enlarged view schematically illustrating an area B of FIG.1 according to an embodiment, and FIG. 5 is an enlarged viewschematically illustrating a portion of the display panel 100 accordingto an embodiment. FIG. 6 schematically illustrates a display panel 100including a stretchable unit 110 with a constant opening size accordingto an embodiment and as a comparative example.

As illustrated in FIG. 4 , the display panel 100 according to anembodiment includes a stretchable unit 110 including an island 112having a wider area, a bridge 114 having a wider width, and an opening116 having a narrower area near the peripheral area PA. FIG. 4illustrates that one stretchable unit 110 adjacent to the peripheralarea PA has configurations (e.g., smaller openings) different from otherstretchable unit 110. In an embodiment, different configurations may beapplicable to one or more (e.g., up to ten) stretchable units 110 fromthe boundary between the display area DA and the peripheral region PAfurther into the DA, e.g., in a horizontal direction or a verticaldirection.

FIG. 5 schematically illustrates configuration differences of threestretchable units 110 according to an embodiment. FIG. 5 illustratesfour area sizes for islands 112, four area sizes for openings 116, andfour widths for bridges 114. Toward the peripheral area PA, areas ofislands 112 (gradually) may increase, widths of bridge 114 may increase,but areas of the opening 116 may decrease.

Although islands 112 have different sizes, the pixels 111 disposed inthe islands 112 may all have the same size.

Referring to FIG. 4 and FIG. 5 , a distance “a” between the PA and anopening 116 (without any intervening opening) is greater than a bridgewidth “b” (or a distance “b” between two openings 116 farther from thePA) and greater than a bridge width “c” (or a distance “c” between twoopenings 116 still farther from the PA).

Referring to FIG. 4 , the width/distance b may be equal to thewidth/distance c but less than the width/distance a.

FIG. 5 illustrates that the width/distance b is greater than thewidth/distance c, and that the width/distance a is greater than thewidth/distance b, and thus the bridges 114 have wider widths toward theedge BD of the display area DA.

An area of an island 112 that is closest to the edge BD of the displaypanel 100 may be wider than that of an island 112 farther from the edgeBD. The area of an opening 116 that is closest to the edge BD of thedisplay panel 100 may be less than that of other openings 116. A shapeof an opening 116 that is closest to the edge BD may be different fromother openings 116 as if part of the opening 116 has been cut off due tothe boundary with the edge BD.

FIG. 6 schematically illustrates that a bridge width “a” (or distance“a” between an opening and the edge BD of the display panel 100) isequal to the bridge width “b” (or distance “b” between two openings 116farther from the edge BD) and is equal to the bridge width “c” (ordistance “c” between two openings 116 still farther from the edge BD).

Since an area of the island 112 that immediately neighbors theperipheral area PA illustrated in FIG. 6 is narrower than that of FIG. 4and FIG. 5 , and since a width of the bridge 114 is narrower than thatof FIG. 4 and FIG. 5 , there is a higher probability that breakage willoccur in the islands 112 or the bridges 114 illustrated in FIG. 6 .

Table 1 shows stain values of the bridges 114 included in eachstretchable unit 110 measured by stretching each of the display panels100 illustrated in FIG. 4 , FIG. 5 , and FIG. 6 by 5%. For each example,the strain of the bridge 114 was measured at points indicated by P ineach of FIG. 4 , FIG. 5 , and FIG. 6 . The points P of FIG. 4 , FIG. 5 ,and FIG. 6 indicate points where the islands 112, the bridges 114, andthe openings 116 start to have new configurations.

TABLE 1 FIG. 4 FIG. 5 FIG. 6 (Example 1) (Example 2) (ComparativeExample) Strain (%) 0.62 0.53 1.95

As shown in Table 1, when FIG. 4 and FIG. 6 are compared, a value ofstrain generated by stress concentration in Example 1 of FIG. 4 (inwhich areas of the islands 112 are increased, widths of the bridges 114are increased toward the edge BD of the display area DA, and areas ofthe openings 116 are reduced) is significantly lower than a value ofstrain generated by stress concentration in the Comparative Example ofFIG. 6 .

In addition, when FIG. 4 and FIG. 5 are compared, a strain value ofExample 2 illustrated in FIG. 5 (in which areas of the islands 112 ofthree stretchable units 110 are increased, widths of the bridges 114 areincreased, and areas of the openings 116 are further reduced) is lowerthan a value of stain associated with Example 1 illustrated in FIG. 4 .

According to an embodiment, gradual structure size decrease/increase maybe implemented for stretchable units 110 from the peripheral area PA ofthe display panel 100, i.e., the edge BD of the display area DA, up toan area corresponding to 1% of the length/width of the display panel 100or 1% of the length/width of the display area DA.

In other words, the areas of islands 112 are gradually increased, thewidths of the bridges 114 are gradually increased, and the areas of theopenings 116 are gradually reduced, from the display area DA toward theperipheral area PA of the display panel 100, i.e., the edge BD of thedisplay area DA. If only one stretchable unit 110 has a specialconfiguration, the conditions are the same as those of FIG. 4 and Table1, and the strain is significantly reduced as compared with theComparative Example.

A gradual structure size change/decrease/increase may be implemented forthe stretchable units 110 disposed in an area corresponding to 1% of thelength/width of the display panel 100 or 1% of the length/width of thedisplay area DA. If the gradual structure size change is formed in anarea that is beyond 1% of the length of the display panel 100, a similareffect may be obtained. However, the effect is weak. As a result, anupper limit of 1% of the length of the display panel 100 was selected asa value at which the effect reached a threshold and no significantfurther increase in the effect could be expected.

FIG. 4 , FIG. 5 , and FIG. 6 schematically illustrate an area B of FIG.1 . Similar to the area B, an area C of FIG. 1 may include a gradualstructure size change.

FIG. 1 to FIG. 6 illustrate that openings 116 of stretchable units havedumbbell-shaped plan views or dumbbell-shaped cross-sections cut along adirection parallel to a display surface with respect to an axisperpendicular to the display surface of the display panel 100. Openings116 may have one or more of other shapes.

FIG. 7 schematically illustrates a circular opening 116 in an area C ofFIG. 1 according to an embodiment. FIG. 8 schematically illustrates across-shaped opening 116 in an area C of FIG. 1 according to anembodiment. FIG. 9 schematically illustrates a flange-shaped opening 116in an area C of FIG. 1 according to an embodiment. FIG. 10 schematicallyillustrates a polygonal opening 116 in an area C of FIG. 1 according toan embodiment.

FIG. 7 to FIG. 10 illustrate that openings 116 may have one more of acircular-shaped cross-section, a cross-shaped cross-section, aflange-shaped cross-section, and a polygonal-shaped cross-section. Across-section may indicate a surface cut along a direction parallel to adisplay surface with respect to an axis perpendicular to the displaysurface of the display panel 100. FIG. 7 to FIG. 10 schematicallyillustrated that an area of an opening 116 closest to an edge BD or acorner is less than an area of an opening 116 farther from the edge BD.In addition, as illustrated in FIG. 7 to FIG. 10 , the pixels 111 may bedisposed between the openings 116.

An embodiment may include elliptical openings 116. In embodiments,cross-shaped openings 116 may have rounded edges, or crossed portions ofopenings 116 are connected with curved or inclined surfaces. Inembodiments, flange-shaped openings 116 may have rounded orpolygon-shaped edges. In embodiments, crossed portions between flangesand columns are connected with curved or inclined surfaces. Inembodiments, polygonal openings 116, e.g., quadrangular openings 116,may have rounded corners or rounded sides.

FIG. 11 is a cross-sectional view taken along a line XI-XI of FIG. 2according to an embodiment. FIG. 11 schematically illustrates a portionof the display area DA of the display panel 100 of FIG. 1 cut in adirection perpendicular to the display surface. An organic lightemitting diode display panel 100 including an organic light emittingdiode may be provided as an example of the display panel 100 illustratedin FIG. 11 . The display panel 100 may include alternative or additionaldisplay elements.

The display panel 100 may include a carrier substrate 140, a substrate120 fixed to the carrier substrate 140, and a plurality of insulatinglayers 130 stacked on the substrate 120. One or more of the insulatinglayers 130 may include stretchable units 110 (including elements 112,114, and 116). The insulating layers 130 are stacked to electricallyinsulate constituent elements such as various wires, semiconductorlayers, or transistors formed on the substrate 120, or to performplanarization on the surface thereof.

The display panel 100, the insulating layers 130, the carrier substrate140, and/or the substrate 120 may include the openings 116. As describedabove, the openings 116 are portions of the stretchable units 110 forfacilitating stretching of the display panel 100.

Referring to FIG. 11 , the openings 116 extend not only through theinsulating layers 130 but also through the substrate 120, so that thecarrier substrate 140 may be exposed. In an embodiment, the openings 116extend through the insulating layers 130 without extending through orextending into the substrate 120. In an embodiment, the openings 116 mayextend through a first group of the insulating layers 130 withoutextending through or extending into the substrate 120 or a second groupof the insulating layers 130. In an embodiment, after the carriersubstrate 140 is removed, a protection layer may be attached onto abottom surface of the substrate 120.

According to embodiments, the display panel 100 including thestretchable unit 110 may effectively minimize or prevent significantphysical breakage between the display area DA and the peripheral areaPA.

Although example embodiments have been described, practical embodimentsare not limited to the described embodiments. Various changes andmodifications may be made to these embodiments without departing fromthe spirit and the scope defined by the appended claims.

DESCRIPTION OF SYMBOLS

-   -   100: display panel    -   110: stretchable unit    -   111: pixel    -   112: island    -   114: bridge    -   116: opening    -   120: substrate    -   130: insulating layer    -   140: carrier substrate    -   DA: display area    -   PA: peripheral area    -   BD: edge

What is claimed is:
 1. A flexible display panel, comprising: a firstarea including a first stretching structure; and a second area includinga second stretching structure, wherein each of the first and secondstretching structures includes: islands each including at least onepixel; bridges extending from the islands and connecting adjacentislands; and openings surrounded by the bridges and the islands, whereinwidths of the bridges of the first stretching structure are differentfrom widths of the bridges of the second stretching structure.
 2. Theflexible display panel of claim 1, wherein the widths of the bridges ofthe second stretching structure are larger than the widths of thebridges of the first stretching structure.
 3. The flexible display panelof claim 1, wherein the bridges of the second stretching structureinclude a first bridge and a second bridge, and a width of the firstbridge is different from a width of the second bridge.
 4. The flexibledisplay panel of claim 3, further comprising: a third area where nopixel is disposed, wherein the second bridge is closer to the third areathan the first bridge, and the width of the second bridge is larger thanthe width of the first bridge.
 5. The flexible display panel of claim 3,wherein the widths of the bridges of the first stretching structure aresubstantially the same.
 6. The flexible display panel of claim 1,wherein shapes of the islands include a substantially tetragonal shape.7. The flexible display panel of claim 1, wherein areas of the bridgesof the first stretching structure are different from areas of thebridges of the second stretching structure.
 8. The flexible displaypanel of claim 1, further comprising: a substrate configured to includethe first area and the second area; and insulating layers disposed onthe substrate, wherein the openings penetrate through the insulatinglayers and the substrate.
 9. The flexible display panel of claim 1,wherein four bridges extend from each of the islands.
 10. The flexibledisplay panel of claim 1, further comprising: a third area where nopixel is disposed, wherein the second area is closer to the third areathan the first area.
 11. A flexible display panel, comprising: a firstarea including a first stretching structure; and a second area includinga second stretching structure, wherein each of the first and secondstretching structures includes: islands each including at least onepixel; bridges extending from the islands and connecting adjacentislands; and openings surrounded by the bridges and the islands, whereinareas of the openings of the first stretching structure are differentfrom areas of the openings of the second stretching structure.
 12. Theflexible display panel of claim 11, wherein the areas of the openings ofthe second stretching structure are smaller than the areas of theopenings of the first stretching structure.
 13. The flexible displaypanel of claim 11, wherein the openings of the second stretchingstructure include a first opening and a second opening, and an area ofthe first opening is different from an area of the second opening. 14.The flexible display panel of claim 13, further comprising: a third areawhere no pixel is disposed, wherein the second opening is closer to thethird area than the first opening, and the area of the second opening issmaller than the area of the first opening.
 15. The flexible displaypanel of claim 13, wherein the areas of the openings of the firststretching structure are substantially the same.
 16. The flexibledisplay panel of claim 11, wherein shapes of the islands include asubstantially tetragonal shape.
 17. The flexible display panel of claim11, further comprising: a substrate configured to include the first areaand the second area; and insulating layers disposed on the substrate,wherein the openings penetrate through the insulating layers and thesubstrate.
 18. The flexible display panel of claim 11, wherein each ofthe islands includes a red pixel, a green pixel, and a blue pixel. 19.The flexible display panel of claim 11, further comprising: a third areawhere no pixel is disposed, wherein the second area is closer to thethird area than the first area.
 20. The flexible display panel of claim11, wherein each of the openings is defined by four of the bridges andfour of the islands.